Calculating-machine



J. C. WAHL CALCULATING MACHINE.

APPLICATION FILED MARI 20. 19:7.

Patented Dec. 20, 1921.

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J. C. WAHL.

CALCULATING MACHINE. APPLICATION FILED MAR.20.1917.

Patented Dec. .20,

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J. C. WAHL. CALCULATING MACHINE.

v APPLICATION FILED MAR- 20,191?- I 1,400,584. Patented Dec. 20, 1921.

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J. C. WAHL. CALCULATING MACHINE.

APPLICATION men MAR 20 1917 J. C. WAHL.

CALCULATING MACHINE.

I 7 APPLICATION FILED MAR- 20,1917- 1,400,584. Patented Dec. 20, 1921.

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J. C. WAHL.

CALCULATING MACHINE.

APPLICATION mm mm. 20. 1912.

1,400,584." Patented 1m 20,1921.

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CALCULATING MACHINE.

APPLICATION FILED mmzo. 1917.

Patentd Dec. 20, 1921.

J. C. WAHL.

nucuunm; MACHINE.

APPUCATION FILED MAR, 20, 1917- I 1,400,584. I Patented Dec. 20, 1921.

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CALCULATING MACHINE. APPLICATION FILED mm. 20. 1911.

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J. c. WAHL.. CALCULATING MACHINE- APPLICATIOH FILED MAR- 20; I917.1,400,584. I Patented Dec. 20, 1921.

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CALCULATING MACHINE.

APPLICATION FILED MAR. 20,1917.

Patented Dec. 20, 1921.

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.CALCULATING MACHINE.

APPLICATlON FILED MAR. 20,1917. v 400 5 4 Patented D60. 20, 1921.

Ill

UNITED STATES PATENT OFFICE.

JOHN C. WAHL, OF CHICAGO, ILLINOIS, ASSIGNOR, BY IlIESNE ASSIGNMENTS, TO

REMINGTON ACCOUNTING MACHINE CORPORATION, OF NEW CORPORATION OF NEWYORK.

YORK, N. Y., A

CALCULATING-MACHINE.

Specification of Letters Patent.

Patented Dec. 20, 1921.

Application filed March 20, 1917. Serial No. 156,009.

To all whom it may concern Be it known that I, JOHN C. WAHL, a citizenof the United States, residing at Chicago. in the county of Cook andState of Illinois, have invented certain new and useful Improvements inCalculating-Machines, of which the following is a specification.

-My invention is an improved adding and subtracting machine designed forthe listing and computation of numbers and is of the class in whichthere is a totalizer and a master wheel adapted to enter numbers thereinone digit at a time. The master wheel is connected by differentialmechanism to a set of ten numeral keys any of which, when operateddetermines the extent of rotation of the master wheel and consequentlythe number inserted in the totalizer.

The decimal relation of the master Wheel to the totalizer is controlledby an escapement device which shifts said wheel step by step upon theactuation of any of the numeral keys. Before entering a number in thetotalizer,- it is necessary to tabulate the master wheel so that it willbe in-co6peration with the decimal order of the totalizer correspondingto the highest digit of the number to be subsequently inserted. To thisend suitable tabulating mechanism for the master wheel has beenprovided. Numbers inserted into the totalizer digit by digit are printedwhen inserted and to this end I have provided a set of type bars andmechanism under the control of the numeral keys to operate said bars.This mechanism is so constructed that the action of the key stores uppower suhicient to operate its associated type bar and when the key hasreached a predetermined position this stored power is released andbrought into act-ion and the type bar is operated by it irrespective ofany further motion on the part of the key.

My herein described machine is also adapted to subtract numbers as wellas add them and to this end I have provided a reversing device for themaster wheel to determine the direction of rotation thereof consequenton the operation of any of.the numeral' keys.

able lever and coincidently with the reversal of the machine, the ribbonassociated with the type bars is shifted so that subtracted numbers willbe printed in a different color.

The platen of my improved machine is arranged to be shifted step by stepwith the master wheel as the numbers are entered one digit at a time andI have arranged the tabulating mechanism so that a single tabulatingmechanism operates simultaneously upon both the master wheel andtheplaten. As a result of this arrangement the operation of a singletabulating key brings the platen into the proper position to receive thefirst digit of the subsequently entered number and also brings themaster wheel in a position to enter said number in its proper place inthe totalizer.

The platen is tabulated prior to the insertion of each number and I havetherefore, arranged the paper feed mechanism which serves to space theplaten line by line to be operated by, and coincidently with, theoperation of the tabulating mechanism.

In general, the operation of my machine is that when it is desired toenter a number therein, the platen and master wheel are first tabulatedto the position of the highest digit of said number by means of one ofthe tabulating keys. The number is then entered digit by digit by meansof the numeral keys, the platen and master wheel spacing step by step inthe opposite direction as the keys are successively depressed. IVhen itis desired to enter a new number, the tabulator key is again operatedwhich action spaces the platen to the next line and re-locates themaster wheel and platen in their proper positions to enter and print thenext number to be inserted.

In general, the object of my invention is to provide an improvedmechanism for carrying out the various operations and functionsabove setforth.

More particularly one of the objects of my invention is to provide acalculating machine with a traveling platen and a traveling decimalcarriage connected therewith and providing improved tabulating means tolo cate positively both the tabulator and the platen by means of asingle operation of a tabulator key.

A further object of my invention is the rovision'of an interlock betweenthe tabuating and numeral keys, whereby when one key of either set isbeing operated 1t will be impossible to operate any of the other keysuntil the. operation which has just been initiated is completed.

A further object of my invention is the provision of a platen operatedby a forcefeed escapement operating in conjunction with my improvedtabulating device as above set forth.

A still further object of my invention is the provision of what I mayterm a stored power printing mechanism in combination with a machine ofthe typedescribed. ThlS mechanism will be fully set forth in thespecification and I shall not further elaborate on it. I

Another object of my invention is the provision of a travelin decimalcarriage which contains certain ca culating elements, such as a masterwheel, a master dog, pawls for accurately locating the master wheel,etc., and connecting such a carriage to a traveling platen in a mannerto cause the carriage and platen to travel in reverse dlrections.

' A further object of my invention is the construction of a calculatingmachine in which the various calculating units required for thefunctioning of a machine as a" whole are mounted in independent supportsand then these supports are united by a common framework. In my improvedmachine herein described, the totalizer is an independent unit, asi'slikewise the master element for operating the same. The differentialmechanism for operating the master mechanisms is mounted in anindependent framework,

and any one of these mechanisms may be adjusted to, perform its functioncorrectly without the necessity of assembling the mechanism in thecomplete machine. Further the platen, platen-rotating and feeding meansare contained in a single structural unit. The printing means are alsocontained in a single unit and said units may be adjusted separatelybefore they are united by the' common supporting framework. Manyadvantages result from my herein described structural arrangement, sincethe various units'which are necessary to comlete a machine may beassembled. and tested in different departments before they are broughttogether for their final assemblagein the complete calculating machine.

Another object of my invention is the provision of a machine printing ona strip ofpaper most conveniently arranged in a roll,

supporting this roll from the framework of the machine and leadin thestrip of paper over a guide to a mova le platen. By this expedient Iavoid the necessity of having to shift a heavy paper roll, step by stepon one hand, of having to shift a type basket step by step on the other.

Another object of my invention is the provision of line spacing meansoperating in conjunction with the tabulating mechanism. It will beremembered from the previous description that before entering a numberin my improved'machine, it is necessary to tabulate the platen to theproper decimal position. I have arranged the paper feed for the platenso that the act of 'tabulating the platen will space the same to thenext line of writing.

The above and many other objects of my Fig. 6 1s a section on the line6--6 of Fig. 2;

Fig. 7 1s a section on the line 7-7 of Fig. 6;

Fig. 8 1s a section on the line 88 of Fig. 6; i

Fig. 9 1s a section on the line 9-9 of Fig. 6'

Fig. 10 is a section on the line 1010 of Fig 6; F ig. 11 is a section onthe line 11.11 of ig. 12 is a front section of the totalizer showingrack on the line 12'-12 of Fig. 11;

Fig. 13 is a plan section on the line 13-13 of Fig. 17;

Fig. 14 is a plan section on the line 1414 of Fig. 3; B Fig. 15 is asection on the line 1515 of Fig. 16 is a section on the line 16-16 ofFig. 15;

Fig. 17 is a section on the line 17-17 of Fig. 3

Fig. 18 is a section on the line 1818 of ig. 19 is a perspective of therear end of machine showing paper feed device;

Fig. '20 is a perspective of the tabulator, paper feed and actuator.

Fig. 21 is a perspective view .of the ribbon control mechanism;

Fig. 22 is a detail view of the tabulator mechanism;

Fig. 23 is a detail section on the line 23-23 of Fig. 7;

Fig. 24 is a detail section on the line 2424 of Fig. 7;

Fig. 25 is a detail of the Geneva gears in the totalizer;

Fig. 26 is a-perspective view of the numeral key action.

Like numerals are applied to the same parts in all the figures.

My machine is composed of an assemblage of independent units having butfew points of connection with each other. Each of these units issupported in an independent framing which in its turn is supportedbetween two outside plates 50 and 51. The separate units of which mymachine is composed are: 1st: the totalizer unit; 2nd: the actuatorunit; 3rd: the printing unit; 4th: the platen unit, and 5th: the numeraland i tabulator keys and parts of the tabulating mechanism which areswung directly between the side plates 50 and 51.

The actuator unit comprises structurally a casting 52, Fig. 2, to whichare attached the side plates 53 and 54. The casting 52 has integral withit the rearwardly extending lugs 55 and 56, which serve to support theribbon spools and the ribbon feeding mechanism. Swung between the sideplates 50 and 51 at the back portion of the machine, is a casting 57-,which serves to support the type bars for printing the numbers and alsoa portion of the ribbon actuating mechanism. The totalizer assemblage iscontained between side plates 58 and 59,

Fig. 3, which are supported from lugs 60,

61, 62 and 63 integral with the casting 52.

The platen is supported on a casting 64, which is attached to thecasting 57 by screws 65 and 66. The platen casting 64 also provides asupport for the escapement advancing mechanism for the platen.

It has been my aim in constructing this machine to make these differentunits of a structure that can be readily assembled and tested withoutreference to any of the other portions of the mechanism and then theseparate units assembled into the complete machine as will appearhereinafter. The connections between the separate units arecomparatively few and each of said units is capable of adjustment toperform its function independently of the action of any other of theunits constituting my improved machine.

T he totalizer.

The totalizer is supported on the lugs 60, 61, 62 and 63 on the frontface of the casting 52 and the totalizer mechanism thereof is supportedbetween two side plates 58 and 59. Rigidly mounted between said gaged bythe master wheel.

plates is a shaft (Fig. 11) on which is rotatably mounted a seriesofcarrying wheels 106, one for each decimal place of the total zer. Eachof the carrying wheels 106 has three planes; 1st: that of a set'of gearteeth 107; 2nd: that of a carrying tooth 108 and 3rd: that .of a.locking disk 10$). A passing hollow or scallop 100 is in the lockingdisk and serves to look a transfer gear 111 which serves to transfer thetens from the totalizer gear 106 to the similar gear in the next higherdecimal place. The transfer gears 111 of which there is one for eachcarrying wheel 106, are rotatably mounted upon a series of swinging arms112 and 113, said arms being rotatably mounted on shafts 114 and 115held between the totalizer side plates 58 and 59. Springs 116 and 117serve to maintain the arms 112 and 113 in contact with a series ofadjusting screws 118 which are mounted in a bar 119 supported betweenside plates 58 and 59.

The transfer gears 111 contain three planes. 1st: a plane of a gear 120adapted to be acted upon by the carrying tectli .10 which teeth it willbe noted are spaced ten teeth apart upon the carrying gears 106. thescallops 110 in the locking disk 10!) being located olpposite saidteeth. The second plane of the transfer gear 111 consists of a starwheel 121 which coiiperates with the locking disk 109 and the presenceof the passing scallop 100 in said disk permits the star wheel to turnduring the time the carrying tooth 108 is acting on the gear 120. Thethird plane of the transfer gear 111 contains a gear 122 which meshes inthe teeth 107 on the transfer gear 106 of next highest order. Thisarrangement constitutes the well known Geneva gear transfer chain and bythis means every tenth tooth rotation of the carrying gear 106 of lowerorder results in a one tooth rotation of the carrying gear of nexthigher order. It is well known that the Geneva chain just described isalways locked and it, therefore. becomes necessary to provide some meansof inserting numbers in the intermediate wheels of said chain.

This is accomplished by the expedient of mounting the transfer gears 111upon the swinging arms 112 and'113 and, by mechanism hereinafter to bedescribed, lifting the transfer gear connecting the carrying wheel 106with the wheel 106 or next lower order bodily out of mesh with saidgears 106 just prior to the rotation of the carrying gear 106 of higherorder when the same is en- As soon as this rotation has been completedthe swinging arm 112 or 113 as the case may be, is restored to itsnormal position and the chain of gears 106 is again locked. It is to benoted that the gears 111 are placed in two angular positions relative tothe carrying gears 106. This is for the purpose of al ed to allow theassociated carrying Wheels 106 to turn, the rectangular slots in thestar wheel 121 are locked on bars 123 or 124, said bars being supportedin the totalizer side plates 58 and 59.

In order to prevent any. of the swinging,

arms 112 or 113 from being displaced from their normal position duringthe insertion of a number I have provided a safety bar 125 which ismounted on a shaft 126 turning in the side plates 58 and 59. This safetybar extends across all the swinging arms 112 and 113 and is providedwith an operating face 127, which is adapted to be operated by a nose128 on each one of the swinging arms 112 and 113. All of these arms areprovided with a locking-surface 130 and the safety barisprovided with acoiiperating locking surface 129. It will be seen that upon any of theswinging arms being operated to raiseits thereupon mounted transfer gear111 from in mesh with its engaged carrying gears 106, that the safetybar 125 will be rotated and the locking surface 130 moving in the pathof the locking surface 129 on the swinging arms 112 and 113 will serveto maintain all of said swinging arms except the one displaced, in theirnormal position. This being true, it follows that no matter howviolently the carrying gears 166 are rotated that the transfer gears 111must be held in mesh with said gears 106 and the carrying operationaccordingly performed.

Meshing with the teeth 107 of the wheels 106 is a series of idlers 131which are mount-- ed on a shaft 132 mounted in the side plates 58 and59. Each of these idlers meshes with a gear 133 which is rigid with anumber bearing wheel 134 and is rotatably mounted on a shaft 135 betweenthe totalizer side plates-58 and 59. Numbers on the disk 134 are visiblethrough'awindow 136 provided in the totalizer cover 137. a

The actuating mechanism.

The actuating mechanism is supported between the side plates 53 and 54which in turn are supported between the side plates 50 and 51. Numbersare inserted into the totalizer by means of a master wheel 140 which isslid ably mounted on a shaft 141, said shaft having a squared section142 which engagIes a square hole in the master Wheel 140. n general themotion of the actuating mechanism may be described as, follows:

A set of numeral keys are provided each of which serves to rotate apeculiar shaped cam which I shall hereinafter term a gooseneck. Each ofthese cams engages a roller supported from a shaft and thereby rotatessaid shaft a differential amount. Mounted on said shaft is a sectorwhich is adapted to engage either a wheel rigid with the shaft 141 or agear in mesh therewith. The sector is mounted so as to swingtransversely and its position is controlled by a sliding plate on thedown stroke of the key. The sliding plate first throws the sector intomesh with either of the gears adapted to mesh therewith, then rotatesthe sector a differential amount and then withdraws the sector from meshwith either of said gears. This results in the rotation of the shaft adifferential amount and the direction of rotation of said shaft isdetermined by the particular one of the gear engaged by said sector.There are a number of dogging and alining operations connected with the.operation of the key which will be described at the proper time.

I shall now describe the mechanism by which the depression of the numberkeys is translated into the appropriate rotation of the master wheel.Pivoted on a rod 145 supported between the side plates 50 and 51, is aseries of key levers 150 to 159. On each of these levers is mounted akey 160 to 169. These keys are of two different species having shankswhich are thrown alternately to the right and left of the point 65 atwhich said keys 160 to 169 are pivoted upon the bars 150 to 159. On eachof the bars 150 to 159 is an car 144 which engages in a single keymechanism hereinafter to' be described, and a projection 146 having aslot 147 in the upper portion thereof. This slot is adapted to engagewith a pin 148 having a head 149,

said pin being riveted in the goose neck cams to engage with one of aseries of pins 172' which are supported by arms 173 from a sector shaft174. The goose neck cams are provided with a concentric slot whichserves to prevent the pins 172 from overthrowing when the goose neck isbrought into engagement therewith. The pins 172 are set in spiralarrangement on'the sector shaft 174 and each one of said pins is longenoughto engage either of two successive oose neck cams 170. It will beobserved in ig. 6 that the goose neck cams are of two speciesalternately arranged. The odd numbered cams that is, the cams for thekeys 1, 3, 5,7 and 9 having their concentric surfaces farther from thecam shaft 143 on which said cams are rotatably mounted. This arrangementis for the purpose of reducing the number of the pins 172. The gooseneck cam 170 attached to the zero key has its concentric slot 175 soplaced that when it engages the pin 172 it will not rotate the sectorshaft 174. The next goose neck cam 170 which is attached to the one keyhas its concentric slot arranged so that when it engages with the firstpin 172 that the sector shaft 174 will be rotated the space of one unit.This arrangement of alternate goose neck cams is continued through theentire series.

The sector shaft 174 is held in its normal position by a spring 66 (Fig.11) which extends between a pin 67 in said shaft and a stud 68 on theframe work. An arm 69 is rigid with the sector shaft and -by its contactwith the tie rod 70 which serves as one of the rods holding the actuatorplates 53 and 54 together, determines a normal position for the sectorshaft 174.

Vhen a key l60169 is first depressed and before the sector shaft 174 isrotated there are certain universal operations which occur. The firstone of these to be described is the operation of a universal rock shaft177 pivoted between the plates 53 and -54 which has mounted on it, apair of arms 178 which serve to support a rod 179 which extends in thepath of the heels 180 which are formed integral with each one of thegoose neck cams 170.

During the first part of the key motion and before the goose neck cam170 contacts with any of the rollers 172 the heel 180 rotates the rockshaft 177 by means of contact with the rod'179. The heel 180 has asurface 181 which is concentric with the shaft 176 and the rod 179 isresting on said surface before the goose necks start to turn the sectorshaft 174.

The rock shaft 177 is held in its normal position by a pair of scissors78 and 79 (Fig. 17 these being pivoted by stud screws 80 and 81 to theframe work. A spring 82 serves to maintain the arms 78 and 79 in contactwith a banking post 83 mounted in the frame work. In between the arms 78and 79 is a pin 84which is mounted on an arm 85 rigid to the rock shaft177. The motion of this rock shaft is as follows: It is first rotated ina counter clockwise direction (Fig. 17) against the spring pressed arm79 during the contact of the heel 180 with the rod 179 which then restson the concentric portion of the heel 180 during the remainder of thedown stroke of the key and finally escapesfrom the back side of the heel180. Just before the numeral key reaches the bottom of its stroke therock shaft is then immediately returned to its normal position as shownin Fig. 17 which of course, returns the master dog 209, the auxiliaryalining pawl 210 and the master pawl 224 to their normal positions.

On the upstroke of the key the rock shaft 177 is rotated in the reversedirection against the scissor arm 78 and this serves to restore'thesliding plate 185 and its connected sector 182 to their normalpositions. Upon the key reaching the end of itsupstroke the rod 179escapes from the heel 180 and the rock shaft 177 again returns to itsnormal position shown in Fig. 17.

This preliminary motion of the rock shaft 177 on the down stroke of thenumeral key is used to perform several universal operations, 1st: to'shift the sector into mesh with either the direct or reverse gear in amanner hereinafter to be described; 2nd: to rotate a master dog whichserves to unlock the chain of gears 106 and 111 in the totalizer; 3rd:to release the master pawl which nor.- mally holds the master wheel fromturning; 4th: to release an auxiliary alining pawl which serves to bringthe totalizer gears into their proper position and 5th: to lock themaster wheel from lateral shifting relative to the totalizer. I will nowdescribe these operations.

On the sector shaft 174 (Fig. 17) is mounted a sector 182 which ispivoted on a rod 183 in a block 184'rigidly mounted on said shaft 174.The sector 182 may be thus transversely tilted with respect to thesector shaft 174. The position of the sector is governed by a plate 185which is slidably mounted in the frame work and has a slot 186 (Fig. 3)in the upper edge thereof and a second slot 187 in the lower edge. En-.gaging the slot 187 is a helical cam 188 which, as it will be seen byreferring to Fig. 3, has its ends twisted so that when said cam isslightly rotated, it will bring the sector 182 from its tilted positionas shown in Fig. 3, into a position at right angles to the sector shaft174. When in this position, the sector will engage either a direct gear189 or a reverse gear 190 according to the position of a reversinghandle hereinafter to be described. When the sector engages the gear189, the master wheel 140 will be rotated in a direction to produceaddition and when the sector 182 engages the reverse gear 190 saidmaster wheel will be rotated in a direction to produce subtraction. Ishall describe the means for controlling the position of these gearshereinafter.

The helical cam 188 is mounted on a shaft 191 pivoted in the frame workand has therein a slot 192 (Fig. 17 in which engages a pin 193 mountedon an am 194 rigid on the rock shaft 177 consequently Y this position,it is in engagement with either the direct gear or reverse gear 190.Differential rotation of the sector shaft 174 which occurs as a result,of the engagement of the goose neck cams 17 0 with one of the pins 17 2will then result in rotation of the gears 189 and 190 and consequentrotation of the master wheel 140.

The helical cam 188 has on it a pin 195 which is adapted to engage a camsurface 196 in a late 197 which is mounted on a rock sha t 198 rotatablymounted in the frame work. Said plate has in it a slot 199 which engagesa roller 200 mounted in an arm 201 rigidly attached to a shaft 202.Referring to the slot 199 it will be seen that said slot has a hump 203and a surface 204 concentric with the shaft 198. The preliminary motionof the rock shaft 17 7 will therefore, first rotate the shaft 202 in aclockwise direction (Fig. 17 and then further motion of said rock shaft177 will leave the shaft 202 in its displaced position without furtherrotation.

I shall now describe the operation of the auxiliary alining pawl and themaster dog. Reference to Figs. 2,11 and 20 will disclose that mountedbetween the side plates 53 and 54 are the rods 207 and 208 and slidablymounted on said rods is a carriage 211 which serves to shift the masterwheel 140 and a master dog 209 and an auxiliary alining pawl 210.Neglecting for a moment the mechanism by which this carriage 211 isshifted, I wish to point out that said carriage has mounted in it a pairof plates 212 and 213, said plates being so arranged as to form a slot214 between them, said slot embracing the master wheel 140 and servingto shift said wheel. on the shaft 141.

The carriage 211 has a side plate 215 on which is mounted the auxiliaryalining pawl 210, said pawl being slidably mounted on a stud216and-being held in its normal position by a spring 217 extendingbetween a stud 218 in the auxiliary pawl 210 and the frame work of thesliding carriage 211. The

' lower portion of the pawl 210 has in it a pin 219 which is pivoted inan arm 220 rigidly mounted to the master dog 209. Obviously, a rotationof themaster dog 209 in a clockwise direction (Fig. 11) willresult inthe withdrawing of the auxiliary pawl 210 from the totalizer carryingwheels 106. The master dog 209 is thus rotated by means of a fork 221 inits lower arm embracing a rod 222 which is supported by hangers 223 fromthe shaft 202 previously described.

Another universal motion which occurs on the first part of the downstroke of the nu-- meral key is the action of the master pawl 224 (Flg.18). Reference thereto will dis master pawl 224. Said pawl is mounted ona shaft 74 rotatably mounted in the frame work and has a nose 75 whichis adapted to enter and aline the teeth of the direct gear 189. A spring76 extending between the pawl 224 and a stud 77 in the frame work tendsto maintain the pawl 224 in the teeth of the direct gear 189 and therebyaline said gear.

To recapitulate the universal motions.

transfer gear 111 from mesh with the totalizer gear 106 in engagementwith the master wheel 140 and the totalizer gear 106 of next lowerorder. The auxiliary alining pawl 210 is withdrawn from the totalizergear 106 of higher order and the master pawl 224 is withdrawn from itsengagement with the direct gear 189. This leaves the totalizer gearsfree to rotate. numeral key results. in rotation of .the sector shaft174 and said shaft is rotated a number of steps dependin upon theparticular key which has been rfepressed;

Full stroke mechanism.

pawls 227 and,228, these pawls being r0 tatably mounted in the framework and being held together by spring 229, which extends between them(Fig. 6). The front full stroke pawl 227 has on it an arm 230 which isadapted to engage an arm rigid to Further depression of the the rockshaft 177. The back full stroke first part of the downward motion of thekey, the rock shaft 177 is rotated in a counter clockwise direction(Fig. 6), This will withdraw the back full stroke pawl 228 from the,path of the teeth 226. When the key has completed its back stroke therod 179 will escape off of the heel 180 and during the-up stroke of thekey the rock shaft 177 will be rotated in the contrary or clockwisedirection. This will result in the withdrawing of the front. fullstrokepawl 227 from the path of the teeth 225. Each one of the goose neck cams17 0 is provided withsets of teeth 225 and 226 and thereby a complete

